Sebastian County government is split among 2 county seats, the cities of Greenwood and Fort Smith. The County Courthouse in Fort Smith is located at 35 South 6th Street, Fort Smith, AR 72901; phone: 479‑782‑5065. The County Courthouse in Greenwood is located at 301 East Center Street, Greenwood, AR 72936; phone: 479‑996‑4195.
Established in 1851, the County is named for William Sebastian [1812‑1865] who served as a U.S. Senator 1848‑1861.
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